ISSN:
0749-1581
Keywords:
59Co NMR
;
tris(acetylacetonato)cobalt(III)
;
preferential solvation
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
A 59Co NMR chemical shift and relaxation study of the preferential solvation of tris(acetylacetonato)cobalt(III) was undertaken by varying the solute concentration in cyclohexane. As expected, the preferred solvation is most pronounced for hydrogen-bond donating solutes, such as chloroform and methanol. However, the expected levelling of the 59Co chemical shift curve on increasing the alcohol molar fraction is not observed because of competing solute-solute interactions in bulk solution. The order of preference is close to that proposed using paramagnetically induced relaxation times or shifts in solutions doped with tris(acetylacetonato)chromium(III). The 59Co line-width measurements correlate with Co(acac)3 rotational correlation times. Contrary to earlier proposals, the 59Co relaxation is claimed to be controlled by modulation of the static quadrupolar tensor of Co(acac)3.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260250608
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